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Mortgage Servicing - Schedule of Activity Related to MSRs - Amortization Method (Footnote) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2017
Servicing Asset at Amortized Cost [Line Items]      
Cumulative effect of fair value election   $ 82,043  
Tax effect of adjustment on retained earnings $ 6,800    
Mortgage Servicing Rights - Amortized Costs [Member]      
Servicing Asset at Amortized Cost [Line Items]      
Decrease in impairment valuation allowance $ 0 [1],[2] 24,788 [1],[2] $ 24,800
Retained Earnings [Member]      
Servicing Asset at Amortized Cost [Line Items]      
Cumulative effect of fair value election   82,043  
Retained Earnings [Member] | Fair Value Agency Mortgage Servicing Rights [Member]      
Servicing Asset at Amortized Cost [Line Items]      
Cumulative effect of fair value election   $ 82,043  
[1] Effective January 1, 2018, we elected fair value accounting for our MSRs previously accounted for using the amortization method, which included Agency MSRs and government-insured MSRs. This irrevocable election applies to all subsequently acquired or originated servicing assets and liabilities that have characteristics consistent with each of these classes. We recorded a cumulative-effect adjustment of $82.0 million to retained earnings as of January 1, 2018 to reflect the excess of the fair value of the Agency MSRs over their carrying amount. We also recognized the tax effect of this adjustment through an increase in retained earnings of $6.8 million and a deferred tax asset for the same amount. However, we established a full valuation allowance on the resulting deferred tax asset through a reduction in retained earnings. The government-insured MSRs were impaired by $24.8 million at December 31, 2017; therefore, these MSRs were already effectively carried at fair value.
[2] Impairment valuation allowance balance of $24.8 million was reclassified to reduce the carrying value of the related MSRs on January 1, 2018 in connection with our fair value election.